Compiler: INTERNAL ERROR: C:\ti\ccsv5\tools\compiler\c6000_7.4.24\bin\cg6x.exe experienced a segmentation fault

The 7.4.x series of releases has gone inactive.  That is, we do not plan any further releases, so we have stopped adding fixes.  Why do you continue to use 7.4.x?  Is it practical for you to upgrade to a current release?  It would be ideal if you could upgrade to the latest, which is version 8.2.3.  To obtain the latest release, please visit the page Code Generation Tools for TI processors and microcontrollers.  

Thanks and regards,

-George

We will not change the compiler any time soon since we have validated our products based on the old compiler.

George Mock said:

It would be ideal if you could upgrade to the latest, which is version 8.2.3

I have tired the new compiler locally, and it doesn't cause my original issue, but had another error:

 error #2640: Object size 18446744071562067968 is greater than maximum supported size 4294967295

on this line:

typedef struct {
  volatile Uint32 Data[0x10000000>>2];
} PCIE_DATA;

We use PCIE_DATA to access PCIe mapped data through a pointer (we don't allocate object).

Since we are not upgrading the compiler anyway, I don't need this to be fixed.

tamo2 said:

 error #2640: Object size 18446744071562067968 is greater than maximum supported size 4294967295

This is a known limitation in the compiler.  There is a request filed to make it bigger, but I am unable to find it right now.

Thanks and regards,

-George

George Mock said:

There is a request filed to make it bigger, but I am unable to find it right now.

However, the PCIE_DATA structure in the example in this thread is only 256 Mbytes and so expected it not to exceed the maximum size.

When using C6000 TI v8.2.3 compiler the following:

typedef struct {
  volatile uint32_t Data[0x10000000>>2];
} PCIE_DATA;

const volatile size_t PCIE_DATA_size = sizeof (PCIE_DATA);

Results in the error:

"../main.c", line 14 (col. 21): error #2640: Object size 18446744071562067968 is greater than maximum supported size 4294967295

Whereas the following compiles:

//typedef struct {
  volatile uint32_t Data[0x10000000>>2];
//} PCIE_DATA;

const volatile size_t PCIE_DATA_size = sizeof (Data);

Is it correct that the maximum size of a field in a structure is different to the maximum size of an array?

For a struct that contains a single array (and the alignment of the elements of that array are at least as strict as the default struct alignment), the array and struct should be of exactly the same size. The issue here is that while the compiler is mishandling the size of the object in both cases, it fails to emit the error message in the second case.

I was mistaken.  The size of the object in this example is under the limit; there should be no error.  It is due to a bug in the tools that this error is reported. 

I've filed CODEGEN-4678 to track this issue.

[Edited to correct my mistake -- Archaologist]

Regarding the source file that is being compiled when this occurs ...

tamo2 said:

INTERNAL ERROR: C:\ti\ccsv5\tools\compiler\c6000_7.4.24\bin\cg6x.exe experienced a segmentation fault

I'd appreciate if we could get a test case as described in the article How to Submit a Compiler Test Case.  Even though it probably will not crash on our system, there are tools we can use to look for problems.  I suspect we will find something.  What happens next is hard to say.  We may be able to give you a workaround.  We may find the problem is also present in version 8.2.x, in which case we would fix it.  Or something like that.

Thanks and regards,

-George